And, in the end, it worked🥳.
After much testing this afternoon/ evening, the solution was to disable G-Sync completely, as simple as that. Even so, I still have to do some testing, because when I open the map (F10) in the Kola scenario, as an example, it freezes for 20 seconds aprox., but after a while, everything works correctly again.
One step has been taken, but now I have to get all the peripherals and consoles working, one by one, until they all work together as before.
Thank you very much for the help. In any case, in the corresponding section, I suggest to the administrators that, if possible, a tutorial could be created to configure DCS from scratch, with Windows settings, with adjustments in the simulator settings, etc. It's very negative that in the end we'll spend more time configuring the equipment than actually flying. I'm aware that there are 1,000,000 different computers due to their components and OS versions, but I'm sure, a permanent post can be made with these things, updating them at the pace of the administrators or as needed. "Parking cores", "not running in administrator mode", "no game bar", "G-Sync stuff", "V-sync off", etc, etc., etc.
A list of recommendations to ensure that installing DCS will not be unfriendly. When everything works fine, there's no problem. When you suddenly update and everything stops working, it drives you crazy. What I discovered today about G-Sync is just one of the 10 or 15 things I've had to change in the process.
Luisflo's post in Best Nvidia Drivers was marked as the answer